A charge efficiency of 95% means that 10Ah must be transferred to the battery to get 9.5Ah actually stored in the battery. The charge efficiency of a battery depends on battery type, age and usage. The battery monitor takes this phenomenon into account with the charge efficiency factor. The auxiliary input can be used to monitor the voltage of a second battery or the midpoint of a battery bank. The auxiliary input can also be used for battery temperature monitoring, together with the optional Temperature sensor for BMV.

CSF shunts 50 years on–past, present and future. Childs Nerv Syst. 2000; 16( 10):800–4. [ PubMed] [ Google Scholar] As soon as the battery monitor detects that the voltage of the battery has reached the set “Charged voltage” parameter and the current has dropped below the “Tail current” for a certain amount of time, the battery monitor will set the state of charge to 100%. Charged Detection Time (m) A fully charged battery will be indicated by a value of 100.0%. A fully discharged battery will be indicated by a value of 0.0%. Hospital care for children with hydrocephalus in the united states: Utilization, charges, comorbidities, and deaths. J Neurosurg Pediatr. 2008; 1:131–7. [ PubMed] [ Google Scholar]Prevalence of congenital hydrocephalus in california, 1991-2000. Pediatr Neurol. 2011; 45( 2):67–71. [ PubMed] [ Google Scholar] May I also ask for some advice on installing a Victron battery monitor?At present I have a lot of sep cables going to the 2x new lithium 100ah plus solar ,mains charger, inverter, temp sensors etc. Room is tight for busbars but I can just about fabricate a mounting for the BVM 712 and a sep neg busbar. My understanding is that all negative loads inc solar and inverter then go to the negative busbar ( ? the temp sensors?) then new cable connects neg busbar to load on BVM and then BVM connected to cable from battery negative ( cross wired). Is that correct? Alternatively the SmartShunt can be connected and be read by a GX device. Connection to the SmartShunt is made via a VE.Direct cable. The charge efficiency of a lead acid battery is almost 100% as long as no gas generation takes place. Gassing means that part of the charge current is not transformed into chemical energy, which is stored in the plates of the battery, but is used to decompose water into oxygen and hydrogen gas (highly explosive!). The energy stored in the plates can be retrieved during the next discharge, whereas the energy used to decompose water is lost. Gassing can easily be observed in flooded batteries. Please note that the ‘oxygen only’ end of the charge phase of sealed (VRLA) gel and AGM batteries also results in a reduced charge efficiency. Current threshold (A)

The SmartShunt is a good alternative for a BMV battery monitor, especially for systems where battery monitoring is needed but less wiring and clutter is wanted. Idiopathic normal pressure hydrocephalus: a systematic review of diagnosis and outcome. Neurosurgery. 2001; 49( 5):1166–86. [ PubMed] [ Google Scholar] The Codman Hakim Programmable Valve (CHPV), also known as the programmable Medos shunt, is a double spring ball valve, where the inlet valve controls the total pressure [ 13]. This specific section consists of a synthetic ruby ball depressed in the valve seat by a 316L flat stainless-steel spring. Opening pressure of the valve is adjusted by raising the spring on a spiral polyethersulfone staircase using the magnetic field from an external handheld apparatus [ 14]. The CHPV has a range of 30 to 200 mm H 2O, with incremental steps of 10 mm H 2O. To confirm the valve setting, plain skull radiography may be needed after shunt pressure adjustment. The Codman Hakim valve can withstand up to a 3 Tesla magnetic field, although the valve must be immediately readjusted after exposure to such a field to avoid complications such as a changed shunt setting from the magnetic interference or permanent disability of the valve [ 13]. In one documented study, the Medos valve behaved very well with one-third of the valves remaining fixed after being exposed to an external magnetic field of 1.5T from an MRI [ 15]. Despite this, the study conducted still found causes of concern as in 11 of 15 occasions, when valves were set to a starting value of 200 mm H 2O, the magnetic field induced by the MRI caused the flat spring of the valve to move across the top of the cam and fall to a level below 30 mm H 2O. A drastic reduction in the pressure setting from 200 mm H 2O to 30 mm H 2O could lead to siphoning of CSF and deleterious effects on the patient, such as subdural hematomas. One of the five Medos valves tested was no longer programmable after four test runs in the MRI. Attempts to reprogram the valve were conducted after 12 hours and 30 days, both of which failed to resolve the issue.If the “Time remaining” indicates three dashes: “---” this means that the battery monitor is in an unsynchronised state. This occurs when the battery monitor has just been installed or after it has been left unpowered and is powered up again. For more information, see see the Synchronising the battery monitor chapter. The SmartShunt 500A is an all in one battery monitor, only without a display. Your phone acts as the display. The SmartShunt connects via Bluetooth to the VictronConnect app on your phone (or tablet) and you can conveniently read out all monitored battery parameters, like state of charge, time to go, historical information and much more.

The SmartShunt is a great option where space is limited or where a less cluttered installation is preferred and provides a lower cost alternative to the Victron BMV-712 Smart for those who like the bluetooth connectivity but don't want or need a permanent display.Please note that if the "Consumed Ah" reading indicates three dashes: “---” this means that the battery monitor is in an unsynchronised state. This mainly occurs when the battery monitor has just been installed or after the battery monitor has been left unpowered and is powered up again. For more information, see the Synchronising the battery monitor chapter. The battery monitor continuously measures the current flow in and out of the battery. Integration of this current over time, if it was a fixed current, boils down to multiplying current and time and gives the net amount of Ah added or removed. Common LiFePO4 values are: 100Ah, 230Ah, 280Ah and 300Ah. There are of course variations of this. Charged Voltage (v) All the usual features are there – such as battery state-of-charge, voltage, current load, time-to-go – and all user-programmable settings …together with extensive historical information which allows you to analyse your system’s performance. SmartShunt can be hard-wired to any ‘GX’ device To understand which size inverter you require, you will need to work out the wattage to match your requirements. To do this, you will need to add up the wattage of each 230V appliance you want to use, and find out their rated power draw. Usually the item manual will provide the wattage draw.

Working principle of a variable pressure valve. An external magnetic tool is used to rotate and adjust the valve. The orientation of the valve is measured by an external indicator. Siphon regulatory devices: their role in the treatment of hydrocephalus. Neurosurg Focus. 2007; 22( 4):1–8. [ PubMed] [ Google Scholar] The 500A model is appropriate for most campervan electrical systems where an amperage between 0-500A is required. If your system requires more than 500A please see the Victron Energy 1000A SmartShunt.

We only stock batteries we would use in our own electrical system.

Please note that if the state of charge indicates three dashes: “---” this means that the battery monitor is in an unsynchronised state. This mainly occurs when the battery monitor has just been installed or after the battery monitor has been left unpowered and is powered up again. For more information, see the Synchronising the battery monitor chapter. Set the Peukert exponent according the battery specification sheet. If the Peukert exponent is unknown, set it at 1.25 for lead-acid batteries and set it at 1.05 for lithium batteries. A value of 1.00 disables the Peukert compensation. The Peukert value for lead- acid batteries can be calculated. Charge efficiency factor (%) Idiopathic normal pressure hydrocephalus: A review for general practitioners. Gerontol Geriatr Med. 2016; 2:2333721416643702. [ PMC free article] [ PubMed] [ Google Scholar] Epidemiology of cerebrospinal fluid shunting. Pediatr Neurosurg. 1995; 23( 5):254–9. [ PubMed] [ Google Scholar] The main function of the battery monitor is to follow and indicate the state of charge of a battery, to be able to know how much charge the battery contains and to prevent an unexpected total discharge.